PHOTOION

Photoionization models from Ali Kinkhabwala produced as part of a PhD
thesis at Columbia Astrophysics Laboratory. A detailed description is
available in astro-ph/0304332 and an
example of their use in the analysis of an XMM-Newton observation of
MCG -6-30-15 is given in this unpublished paper.

To run these models you will need the source
tar file, data
tar file and photoion_lmodel.dat
file. The
source can be built under either xspec v11 or v12. For v11
the source tar file should be untarred in your $LMODDIR directory and
the contents of photoion_lmodel.dat added to the lmodel.dat file. For
v12 the source tar file can be untarred in its own directory. The data
tar file should be untarred in its own directory which will then be
specified within xspec using the command "xset PHOTOION_DIR
directory-name" where directory-name is the directory in which the
data files were placed.

Note that the data tar file was updated on Nov 7, 2006 because the
earlier version was missing several files.

NEUTRAL:

Here's an example of a set of model parameters
for NEUTRAL applied to a power-law spectrum. Abundances are from the
"ISM" column of Table 2 in Wilms, Allen, & McCray 2000, ApJ, 542,
914. (see below for a description of the parameters.)

where the parameters are
1: N_H - Neutral hydrogen column density.
2: sigma_v - Radial velocity width (sigma) of absorbing medium.
If sigma_v=0, line absorption is NOT included.
If sigma_v>0, line absorption IS included.

VNEUTRAL:

Here's an example of a set of model parameters
for VNEUTRAL applied to a power-law spectrum. Abundances are from the "ISM" column of Table
2 in Wilms, Allen, & McCray 2000, ApJ, 542, 914. (See below for a description of the parameters)

XIABS:

Here's an example of a set of model parameters
for XIABS applied to a power-law spectrum. This models uses a
user-defined distribution in ionization parameter. The file "xi.dat"
must exist in the directory you're running XSPEC in. An example can be
found in photoion_dat/xi.dat. The ionization parameter distribution is
defined by simply connecting the
user-defined points in xi.dat with line segments and normalizing. The
"fractional ionic abundances" used were taken from an XSTAR simulation
of an extremely-low-column-density medium irradiated by a Gamma=2 power
law. (See below for a description of the parameters)

PHXI:

Here's an example of a set of model parameters
for PHXI. This models uses
a user-defined distribution in ionization parameter. The file "xi.dat"
must exist in the directory you're running XSPEC in. See
photoion_dat/xi.dat for an example of this file. The
ionization parameter distribution is defined by simply connecting the
user-defined points in xi.dat with line segments and normalizing. The
"fractional ionic abundances" used were taken from an XSTAR simulation
of an extremely-low-column-density medium irradiated by a Gamma=2 power
law. (See below for a description of the parameters)

MULEXT:

Here's an example of a set of model parameters
for MULEXT. MULEXT allows
the user to multiply any spectrum by an external "opacity" spectrum
located in file "mulext.qdp".
(See below for a description of the parameters)

TAUEXT:

Here's an example of a set of model parameters
for TAUEXT. TAUEXT allows
the user to multiply any spectrum by an external "optical depth"
spectrum located in file "tauext.qdp".
(See below for a description of the parameters)